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Securities - Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract] |  |  |
Gain (loss) realized in earnings |  | $ 538 | $ (63)
OTTI losses recognized in earnings | $ 0 | 0 | (49)
Total reclassified amount before tax |  | 538 | (112)
Tax expense (benefit) |  | 191 | (38)
Total reclassifications out of accumulated other comprehensive loss |  | $ 347 | $ (74)

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- Definition Tax effect on items included in earnings for the period and reclassified from other comprehensive income (loss) during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition After tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from OCI portion related to unrealized gain/loss on available for sale securities. + References No definition available. + Details
Name: | inbk_TotalReclassificationsOutOfAccumulatedOtherComprehensiveIncomeRecognizedThroughNetIncomeAvailableForSaleSecuritiesAdjustmentNetOfTax
Namespace Prefix: | inbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Before tax amount of the income statement impact of the reclassification adjustment of accumulated gain (loss) from OCI portion related to unrealized gain/loss on available for sale securities. + References No definition available. + Details
Name: | inbk_TotalReclassifiedAmountRecognizedThroughNetIncomeAvailableForSaleSecuritiesAdjustmentBeforeTax
Namespace Prefix: | inbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8B -URI http://asc.fasb.org/extlink&oid=27724398&loc=SL6284393-111563 + Details
Name: | us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration